An ultraviolet LED condensing device

Abstract

The utility model relates to a kind of UV LED spotlight device in the field of ultraviolet lamp, including light source module and condenser lens subassembly, light source module includes COB ultraviolet LED light source and the substrate of bearing this light source, condenser lens subassembly includes base and lens barrel, base is fixed on substrate and is surrounded and is set in the peripheral of COB ultraviolet LED light source, lens barrel is installed on base, the inside of the lens barrel is equipped with cavity with internal thread and two groups above lens group, lens group is engaged with the internal thread of lens barrel by the external thread of its side wall setting, so that lens group can be screwed in or spin out in cavity to adjust its axial position, can flexibly, conveniently adjust the size and focal distance of final exit light spot according to actual application demand, greatly improve the adaptation ability of equipment to different optical fiber core diameter and working scene.

Description

Technical Field

[0001] This utility model relates to the field of ultraviolet lamps, and in particular to an ultraviolet LED focusing device. Background Technology

[0002] In applications such as ultraviolet curing and exposure, COB (Chip-on-Board) packaged ultraviolet LED light sources are widely used due to their high power density. To efficiently focus and couple the wide-angle divergent light emitted by the light source into the optical fiber or directly onto the working surface, a complex multi-lens condenser assembly is typically required. In existing technologies, the lenses in such condenser assemblies are mostly fixed, and their positions cannot be adjusted after assembly. This results in the entire optical path system having a fixed output spot size and focal distance once manufactured, making it inflexible to adapt to different fiber core diameters or different working distances, greatly limiting the equipment's versatility and the flexibility of process adjustments.

[0003] Furthermore, COB ultraviolet LEDs generate a significant amount of heat during operation, and while the condenser lens assembly focuses the light, its optical lenses themselves also absorb some ultraviolet energy and convert it into heat. Existing structures generally lack effective thermal management of the lens barrel, leading to heat accumulation. Under continuous heat load, the metal material of the lens barrel undergoes thermal expansion. This minute deformation alters the relative positions of the internal fixed lenses, causing "thermal drift" of the pre-calibrated optical path focus, resulting in a decrease in the quality of the emitted light spot and reduced coupling efficiency. Utility Model Content

[0004] In order to overcome the shortcomings of existing technical solutions, this utility model provides an ultraviolet LED focusing device, which can effectively solve the technical problems of unstable light path caused by non-adjustable light path and lack of thermal management.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] An ultraviolet LED focusing device includes a light source module and a focusing lens assembly. The light source module includes a COB ultraviolet LED light source and a substrate supporting the light source. The focusing lens assembly includes a base and a lens barrel. The base is fixed to the substrate and surrounds the COB ultraviolet LED light source. The lens barrel is mounted on the base. The interior of the lens barrel has a cavity with internal threads and two or more lens groups. The lens groups engage with the internal threads of the lens barrel through external threads on their sidewalls, allowing the lens groups to be screwed in or out of the cavity to adjust their axial position. The outer sidewall of the lens barrel is provided with a heat-conducting copper pipe, a support frame, and a heat sink. The support frame is fixedly connected to the sidewall of the lens barrel. The heat-conducting copper pipe surrounds the outer wall of the lens barrel. A heat-conducting plate is provided in the middle of the support frame. One end of the heat-conducting copper pipe extends to the bottom surface of the heat-conducting plate and is in contact with the bottom surface of the heat-conducting plate. The heat sink is mounted on the support frame and is in contact with the top surface of the heat-conducting plate.

[0007] Furthermore, there are two or more heat-conducting copper pipes, all of which are wrapped around the outer surface of the mirror barrel, with one end converging and adhering to the bottom surface of the heat sink.

[0008] Furthermore, the heat-conducting copper tube is arranged on the outer surface of the mirror tube in a spiral winding manner.

[0009] Furthermore, the lens assembly consists of a lens sleeve and a spherical lens, which are disposed on the inner wall of the lens sleeve. The outer wall of the lens sleeve is provided with external threads, and the end face of the lens sleeve is provided with an adjustment opening.

[0010] Furthermore, the substrate is connected to the base by bolts, the lens barrel is threaded to the base, and a focusing lens is provided in the middle of the base, which is aligned with the COB ultraviolet LED light source.

[0011] Furthermore, the areas where the heat sink and the heat-conducting copper pipe contact the heat-conducting plate are coated with thermally conductive silicone grease.

[0012] Furthermore, all of the lens groups are condenser lens groups.

[0013] Compared with existing technologies, the advantages of this invention are as follows: It employs a structure where the lens group engages with the internal thread of the lens barrel via external threads on the sidewall. The operator can precisely control the position of the lens group along the optical path axis by rotating one or more lens groups. This allows users to flexibly and conveniently adjust the size and focal distance of the final emitted light spot according to actual application needs, greatly improving the equipment's adaptability to different fiber core diameters and working scenarios. Because a surrounding heat-conducting copper pipe is installed on the outer wall of the lens barrel, and it is closely fitted with the heat-conducting plate in the middle of the support frame and the heat sink at the top, a highly efficient thermal management path is formed. This allows the heat generated by the lens group inside the lens barrel to be quickly dissipated into the environment through the heat sink, effectively reducing the operating temperature of the lens barrel. This significantly suppresses thermal drift caused by thermal expansion, ensuring the stability of the optical path focus and light spot quality under high power and long-term operation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the lens group adjustment according to this utility model;

[0016] Figure 3 This is a schematic diagram of the optical path of this utility model;

[0017] Figure 4 This is a schematic diagram of the substrate in this utility model;

[0018] The diagram is labeled as follows: 1-COB UV LED light source, 2-substrate, 3-base, 4-lens tube, 5-lens group, 501-lens sleeve, 502-spherical lens, 510-first lens group, 520-second lens group, 530-third lens group, 503-adjustment opening, 6-heat-conducting copper pipe, 7-support frame, 8-heat sink, 9-heat-conducting plate, 10-focusing lens, 11-operating lever. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] The following is combined Figures 1-4 A detailed description of an ultraviolet LED focusing device according to this utility model is provided below:

[0021] An ultraviolet LED focusing device includes a light source module and a focusing lens assembly. The light source module includes a COB ultraviolet LED light source 1 and a substrate 2 supporting the light source. The focusing lens assembly includes a base 3 and a lens barrel 4. The base 3 is fixed to the substrate 2 and surrounds the COB ultraviolet LED light source 1. The lens barrel 4 is mounted on the base 3. The interior of the lens barrel 4 has a cavity with internal threads and three sets of lens groups 5. The lens groups 5 are connected to the inner cavity of the lens barrel 4 through external threads on their sidewalls. The threaded engagement allows the lens assembly 5 to be screwed in or out of the cavity to adjust its axial position. The outer wall of the lens barrel 4 is provided with a heat-conducting copper pipe 6, a support frame 7, and a heat sink 8. The support frame 7 is fixedly connected to the side wall of the lens barrel 4. The heat-conducting copper pipe 6 surrounds the outer wall of the lens barrel 4. A heat-conducting plate 9 is provided in the middle of the support frame 7. One end of the heat-conducting copper pipe 6 extends to the bottom surface of the heat-conducting plate 9 and is in contact with the bottom surface of the heat-conducting plate 9. The heat sink 8 is installed on the support frame 7 and is in contact with the top surface of the heat-conducting plate 9.

[0022] The system employs a structure where lens group 5 engages with the internal thread of lens barrel 4 via external threads on the sidewall. Operators can precisely control the position of lens group 5 along the optical path axis by rotating one or more lens groups 5. This allows users to flexibly and conveniently adjust the final output spot size and focal distance according to actual application needs, greatly improving the equipment's adaptability to different fiber core diameters and working scenarios. A surrounding heat-conducting copper pipe 6 is installed on the outer wall of lens barrel 4, closely fitting with the heat-conducting plate 9 in the middle of the support frame 7 and the heat sink 8 at the top, forming an efficient thermal management path. This rapidly dissipates the heat generated by the lens group 5 inside lens barrel 4 into the environment through heat sink 8, effectively reducing the operating temperature of lens barrel 4. This significantly suppresses thermal drift caused by thermal expansion, ensuring the stability of the optical path focus and spot quality under high power and long-term operation.

[0023] The heat-conducting copper pipe 6 surrounds the outer wall of the mirror barrel 4, increasing the heat exchange area and improving heat conduction efficiency. Meanwhile, the support frame 7, as a core load-bearing structure, not only achieves a fixed connection with the mirror barrel 4 but also integrates a heat-conducting plate 9 to receive the heat transferred by the heat-conducting copper pipe 6 and extend it laterally to the heat sink 8. This integrated, compact design achieves efficient heat dissipation without significantly increasing the device's size, resulting in a compact structure and high reliability.

[0024] Two or more heat-conducting copper pipes 6 are provided, and they all surround the outer surface of the mirror barrel 4. One end of each pipe converges and fits against the bottom surface of the heat sink. The multiple heat-conducting copper pipes 6 significantly increase the contact area with the outer wall of the mirror barrel 4, forming multiple parallel heat flow paths. This allows heat to be transferred to the heat sink more quickly and evenly, eliminating the risk of local overheating and improving the reliability and efficiency of the entire heat dissipation system.

[0025] The heat-conducting copper tube 6 is arranged in a spiral winding manner on the outer surface of the lens barrel 4. The spiral winding arrangement maximizes the contact length between the heat-conducting copper tube 6 and the outer wall of the lens barrel 4. This structure not only provides a more secure mechanical fixation, but more importantly, it provides a more uniform temperature field along the axial direction of the lens barrel 4, further reducing the deformation of the lens barrel 4 caused by temperature gradients, and playing a synergistic role in suppressing thermal drift.

[0026] The lens assembly 5 consists of a lens sleeve 501 and a spherical lens 502, which are disposed on the inner wall of the lens sleeve 501. The outer wall of the lens sleeve 501 is provided with external threads, and the end face of the lens sleeve 501 is provided with an adjustment opening 503. The lens sleeve 501 serves as a standard mechanical adjustment unit, while the spherical lens 502 serves as the core optical element, facilitating separate processing, assembly, and maintenance. The adjustment opening 503 on the end face makes optical path adjustment operations simpler and more precise, without damaging the optical element.

[0027] Thermal grease is applied to the areas where the heat sink 8 and the heat pipe 6 contact the heat-conducting plate 9. This effectively fills the microscopic gaps between the metal contact surfaces, greatly reduces contact thermal resistance, and improves the heat transfer efficiency from the heat pipe 6 to the heat-conducting plate 9, and then from the heat-conducting plate 9 to the heat sink 8. This is a key practice to ensure that the theoretical performance of the entire heat dissipation system is fully realized.

[0028] Furthermore, the radiator 8 can be either an air-cooled radiator 8 or a water-cooled radiator 8. Users can choose radiators with different efficiencies based on the overall heat dissipation requirements of the equipment, installation space, and cost budget. This allows the focusing device to be adapted to various application scenarios ranging from ordinary power to extremely high power, expanding the product's application range.

[0029] Furthermore, the substrate 2 is connected to the base 3 by bolts, the lens barrel 4 is threaded to the base 3, and a condensing lens 10 is provided in the middle of the base 3, which is aligned with the COB ultraviolet LED light source 1. All lens groups 5 are condensing lens groups.

[0030] This embodiment of an ultraviolet LED focusing device mainly includes a light source module and a focusing mirror assembly.

[0031] The light source module includes a COB ultraviolet LED light source 1 and an aluminum substrate 2. The COB ultraviolet LED light source 11 is die-bonded to the central region of the substrate 2 using thermally conductive adhesive, and a thermistor can be embedded inside the substrate 2 for real-time temperature monitoring.

[0032] The condenser lens assembly includes a base 3, a lens barrel 4, three lens groups 5, and a heat dissipation system.

[0033] During assembly, the base 3 is first fixed to the substrate 2 with four countersunk bolts. The circular positioning boss at the bottom of the base 3 mates with the corresponding groove on the substrate 2 to ensure concentricity. An aspherical condenser lens 10 is pressed into the mounting groove in the middle of the base 3 to ensure that its optical axis is strictly aligned with the center of the COB ultraviolet LED light source 1.

[0034] Next, the lens barrel 4 is screwed into the internal thread at the upper end of the base 3 through the external thread at its lower end and locked. The inside of the lens barrel 4 is machined with a stepped cavity with internal threads.

[0035] The three lens groups 5 have similar structures, each consisting of a lens sleeve 501 with external threads and a spherical lens 502 pressed inside it. The first lens group 510 has a first spherical lens pressed into its lens sleeve 501, the second lens group 520 has a second spherical lens pressed into its lens sleeve 501, and the third lens group 530 has a focusing lens pressed into its lens sleeve 501. The first lens group 510 is screwed into the large-diameter portion of the cavity from the lower end of the lens barrel 4, followed by the second lens group 520 from the upper end of the lens barrel 4, and finally the third lens group 530 is screwed in. Each of the three lens sleeves 501 has symmetrical adjustment openings 503 on its end face. The operating lever 11 can be inserted into the adjustment openings 503 to rotate the lens sleeves 501, thereby adjusting their axial positions in the optical path.

[0036] The heat dissipation system is installed as follows: First, three high thermal conductivity copper tubes 6 are tightly attached to the outer wall of the mirror barrel 4 in a spiral winding manner. Then, a support frame 7 is installed, its vertical side fixed to the outer wall of the mirror barrel 4 with screws, and its horizontal side serving as a heat-conducting plate 9. The free ends of the three copper tubes 6 are laid side-by-side and straight, ensuring their surfaces are in close contact with the bottom surface of the heat-conducting plate 9. A layer of high-performance thermal grease is applied to the contact interface to fill any gaps. Finally, the finned air-cooled radiator 8 is installed on the support frame 7 with screws, ensuring its bottom surface is in close contact with the top surface of the heat-conducting plate 9, and thermal grease is also applied to the interface.

[0037] The high-intensity ultraviolet light emitted by the COB ultraviolet LED light source 1 is first initially collimated by an aspherical lens, reducing the divergence angle. Subsequently, the light beam undergoes fine shaping and convergence through an optical system composed of the first, second, and third lens groups. By independently rotating and adjusting the three lens groups 5, the aberrations and convergence state of the beam can be more precisely controlled, ultimately forming a high-quality light spot with adjustable size, controllable position, and superior energy distribution at the focal plane of the focusing lens to meet the requirements of higher precision applications. During this process, the heat generated by the lens barrel 4 and internal lenses is efficiently conducted to the air-cooled heat sink 8 through the lens barrel 4, the heat-conducting copper pipe 6, and the heat-conducting plate 9, and then dissipated into the surrounding air, thus ensuring the thermal stability and reliability of the optical path during long-term operation.

[0038] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A UV LED focusing device, comprising a light source module and a focusing lens assembly, wherein the light source module includes a COB UV LED light source and a substrate supporting the light source, and the focusing lens assembly includes a base and a lens barrel, the base being fixed to the substrate and surrounding the COB UV LED light source, and the lens barrel being mounted on the base, characterized in that: The internal cavity of the lens barrel is provided with an internally threaded cavity and two or more lens groups. The lens groups are engaged with the internal threads of the lens barrel by the external threads on their side walls, so that the lens groups can be screwed in or out of the cavity to adjust their axial position. The outer wall of the lens barrel is provided with a heat-conducting copper pipe, a support frame and a heat sink. The support frame is fixedly connected to the side wall of the lens barrel. The heat-conducting copper pipe surrounds the outer wall of the lens barrel. A heat-conducting plate is provided in the middle of the support frame. One end of the heat-conducting copper pipe extends to the bottom surface of the heat-conducting plate and is in contact with the bottom surface of the heat-conducting plate. The heat sink is installed on the support frame and is in contact with the top surface of the heat-conducting plate.

2. The ultraviolet LED concentrating device according to claim 1, characterized in that: The heat-conducting copper pipes are provided in two or more, and both of the heat-conducting copper pipes are wrapped around the outer surface of the mirror tube, with one end converging and adhering to the bottom surface of the heat sink.

3. The ultraviolet LED concentrating device according to claim 1, characterized in that: The heat-conducting copper tube is arranged in a spiral winding manner on the outer surface of the mirror tube.

4. A UV LED concentrating device according to any one of claims 1-3, characterized in that: The lens assembly consists of a lens sleeve and a spherical lens, which are disposed on the inner wall of the lens sleeve. The outer wall of the lens sleeve is provided with external threads, and the end face of the lens sleeve is provided with an adjustment opening.

5. A UV LED concentrating device according to any one of claims 1-3, characterized in that: The substrate is connected to the base by bolts, the lens barrel is threaded to the base, and a focusing lens is provided in the middle of the base, which is aligned with the COB ultraviolet LED light source.

6. A UV LED concentrating device according to any one of claims 1-3, characterized in that: The areas where the heat sink and the heat-conducting copper pipe contact the heat-conducting plate are coated with thermal grease.

7. A UV LED concentrating device according to any one of claims 1-3, characterized in that: All the lens groups are condenser lens groups.

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